If you want to convert a 357/40 p229 to 9mm and get it to work 100% you will need a the 22LR to 9mm caliber X-change kit (which comes with a slide, barrel, spring, and mag) and a frame made in Exeter, NH--not Germany.

Sig then claims that this STILL may not work.

They may be lying to get me to buy another gun instead of a 200 dollar kit.